John ham



(No Model.) 7 x J. HAM.

v STEAM BOILER FURNACE.

- Patented 139.1,1885.

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WITNESSES; INVEISITQR 2224/ f; A: BY a 1x Emma YMW'M W ATTORNEYS JOHNHAM,

PATENT tries,

OF NEWV YORK, N. Y.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 331,636, dated December1, 1885.

Application filed November 13, 1884. Renewed October 10, 1855, SerialNo. 179,567. (No model.)

To all whom it may concern.-

Be it known that I, JOHN HAM, a citizen of the United States, residingat New York, in the county and State of New York, have invented new anduseful Improvements in Steam- Boiler Furnaces, of which the following isa specification.

The object of my invention is to provide a novel combination andarrangement of devices for promoting the combustion in steam-boilerfurnaces, and this I accomplish in the manner and by the meanshereinafter described and claimed, reference being made to theaccompanying drawings, in which Figure l is a longitudinal verticalsection of a steam-boiler provided with my improved furnace. Fig. 2 is atransverse vertical section of the same in the plane a: as, Fig. 1.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a horizontal cylindrical boilerprovided with fire-tubes a. B is the fire-chamber; O, the grate; I), theash-pit; E, the bridge-wall, and F the combustion-chamber. G areair-fines, which pass through the boiler, their rear ends extendingthrough the back wall, H, of the furnace into the open air. The frontends of the air-flues are connected by suitable pipes, b, c,and d,andthe necessary elbows, d, to the air-distributer I, which is situated inthe combustion-chamber F, and extends transversely through the same.This air-distributer I consists of a metal cylinder, which is closed atboth ends, and provided with alarge number of perforations, throughwhich perforations the air drawn or forced into the airfiues Gpasses,well distributed, into the combustion-chamber F, and comes intocontact therein with the products of combustion of the fuel on the grateO.

In the drawings I have shown two air-fines G; but only one or any numbercan be used, the number used'corresponding to the amount of air requiredfor the complete combustion of the furnace-gases.

In order to avoid as much as possible the actual contact of the hot gaswith the air-distributer I, I place the same in a free space, K, leftbetween the bridge-wall E and the bottom wall,L,of thecombustion-chamber F, the top of the air-distributer being on a linewith the top of the respective walls E L. The

external air introduced into the combustionchamber F, whether sointroduced by the natural draft of the chimney or by means of a blower,is heated approximately to the temperature of the water in the boilerwhile passing through the air-fines G, and is still further heated inpassing through the pipes Z) c d,which lead to the air-distributer I,and therefore does not cool the gas as much as if the cold air wereintroduced directly into the combustion-chamber.

It is not necessary to use separate long tubes for the air-fines G, as,for instance, if it should be desired to add my improvement to anordinary tubular boiler, the pipes b,c,and d, which form the connectionwith the airfiues G and the air-distributor I, can be directly securedto one, two, or more of the firetubes a of the boiler, said fire-tubesthen act ing in the capacity of air-tubes.

The object of my invention is to provide means for the introduction ofheated and welldistributed air into the combustion-chambers ofsteam-boiler furnaces for procuring a better combustion of thefurnace-gases, whereby the heating capacity, and consequently theefficiency of the furnace,is increased,and great economy in fuel iseffected.

I am aware that an air-heating chamber in the upper part of afuel-chamber has been connected with one end of an airline passinglongitudinally through a boiler; also, that an air-heater at the frontof a fuel-chamber has been connected by pipes with an air-distributingbox supported in rear of a bridgewall with the upper sides of the walland the box on a level. Such features therefore I do not broadly claim.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. The combination of the fire-chamber B, the combustion-chamber F, andthe bridgewall E, with the boiler A, the transverse foraminousair-distributor Larranged in rear of the bridge-wall, the air-flue G,passing longitudinally through the boiler, and pipes b, c, and (1,connecting the end of the air-flue which is at the front end of theboiler with the air-distributer, saidpipes being subject to heat fromthe fire-chamber, to constitute a supplementary heater to the air-fluein the boiler, substantially as described.

2. The combination of the fire-chamber B, necting the end of theair-flue which is at the the combustion-chamber F, and the bridgefrontend of the boiler with the air-distribu- Wall E,arranged in relation tothe bottom wall, ter, substantially as described.

L,0f the combustion-chamber to form the clear In testimony whereof Ihave hereunto set 15 5 space K,with the boiler A, the airflne G, exmyhand in the presence of two subscribing tending longitudinally throughthe boiler, the witnesses.

foralninous air-distributer I, arranged in said JOHN HAM. clear spaceWith its upper side approximately on a line with the tops of the bottomL and Witnesses:

IO bridge E, and a pipe-connection subject to- J ABEZ BURNS,

direct heat from the fire-chamber and con- 1 E. F. KASTENHUBER.

